Mine is a 2010 GT in black. Since the car is already black, I left the CDC lower chin spoiler alone. It's been scraped a few times in the last 9 yrs. Abt 2 weeks ago, I came down my daughters steep dirt + gravel driveway..and nailed the cdc lower chin spoiler, on a rock.... aprx 2' from the main road. Up came a cloud of debris. Turns out I split the damn chin spoiler, from the top..almost to the bottom on passenger side, right where it curves around the side. The new CDC splitter just arrived last week. And no, I'm not gonna paint it black either. The most it ever needs is some armoural once every 2 months in the spring/summer / fall.
On the 10-11-12 cars the CDC lower chin spoiler has intake brake ducts on each side, so I bought the optional CDC front brake duct kit, which included 2 x lengths of 2.5" ID silicone hose, and 2 x new 14.5" front dust covers, complete with the oval shaped pieces welded on... that the silicone hoses slide over. On the back end of the CDC lower chin spoiler, the ducts are injection molded right into the lower chin spoiler..and come out the back side like a pipe on each side. The brake duct kit also comes with 2 x abs plastic fittings, that screw onto these pair of short pipes. The one on the passenger side is unique, it has an offset built into it, so it goes down, then a right angle... designed that way to go under the windshield wiper fluid bottle.
In normal operation, the brake duct cooling works superb. No more brake stink, if you happen to be heavy handed on the brakes. My 18" x 10" wheels won't clear the typ 14" big brake kits so still using the oem 12.4" rotors, and HPS pads ( + SS braided front and rear brake lines + better grade of brake fluid). I tried the CDC brake kit as an experiment, and it has worked out very well...for a street car. Stick your head out the window at 50-100 mph..air is free, so why not use it.
On the 10-11-12 cars the oem upper grille is 80% blocked off. Replaced with a 7 bar grille (which also deletes the oen upper foglamps + pony etc). I looked at the 5 bar lower grille, similar to what you have, but decided it impeded airflow too much. I need all the air I can get into both upper + lower grilles, since I have a small roush M90 blower, 18" tall x 21" wide HE etc.